EIGRP – Metric review, random “offset-list” lab for Path Selection, Feasibility Condition and Variance discussion, and will PBR config override offset-list?

Above is the lab that this post turns into pretty fast once the MPLS is live and installs itself around on EIGRP routers, lots of good info, I advise trying to make through this post if you are rusty on EIGRP Path Selection configuration! šŸ™‚ How EIGRP Calculates Metrics, Topology Table, and Feasibility Condition By … Continue reading EIGRP – Metric review, random “offset-list” lab for Path Selection, Feasibility Condition and Variance discussion, and will PBR config override offset-list?

EIGRP – Stub review, default behaviors, basic configuration, Summary-Address and Leak-Maps config, and verification!

I have added loopbacks to simulate some EIGRP Networks behind our two Stub routers, to demonstrate some different concepts such as Summary Address and Leak-Maps, however I will start right at the beginning of EIGRP Stub routing and what it does. My labbing kind of got long winded but I really wanted to drive some … Continue reading EIGRP – Stub review, default behaviors, basic configuration, Summary-Address and Leak-Maps config, and verification!

EIGRP – Quick review of EIGRP Named Mode, walk through of “Named Mode” EIGRP Configuration with Authentication across the entire EIGRP AS 100 Domain!

Using this Topology I will work across the EIGRP Domain using EIGRP Named Mode, possibly mixing some "Classic" mode EIGRP Routers in there as well, just to see how things are different once I've gotten into a Named Mode groove of configuration. Honestly before running through this lab (when studying for my CCNP R/S) I … Continue reading EIGRP – Quick review of EIGRP Named Mode, walk through of “Named Mode” EIGRP Configuration with Authentication across the entire EIGRP AS 100 Domain!

BFD – (Bidirectional Forwarding Detecetion) review, what problem it solves, configuration, and verification!

The need for BFD (Bidirectional Forwarding Detection) is configured to speed up the "Detection" of a link down, which is 15 seconds by default without any Routing Protocols Hello / Dead Timers triggering this re-convergence (finding an alternate path), which now adays might as well be 15 hours. Now of course this can be solved … Continue reading BFD – (Bidirectional Forwarding Detecetion) review, what problem it solves, configuration, and verification!

VRF-Lite – Full review of VRF-Lite, how it differs from VRF, and configuration / verification commands for exam day!

VRF-Lite is quite literally a light weight version of VRF Instances, where instead of using VRF to accomplish complex configurations, it simply segregates IP Routing / Instructs Physical Interfaces to use the specific VRF Route Table needed to function. Quick guide to configuring the above Topology with VRF-Lite First you will want to use "ip … Continue reading VRF-Lite – Full review of VRF-Lite, how it differs from VRF, and configuration / verification commands for exam day!

IP SLA – Covering ENARSI topics of configuring SLA to detect jitter, tracking objects, delay, connectivity issues!

Wanted to cover this in a non-fancy lab, very straight forward, as this is a very forgettable subject for me as you kind of set it and forget it on real life networks. What IP SLA is and how it can be used to optimize your network Not to be confused with "Tracking Objects" for … Continue reading IP SLA – Covering ENARSI topics of configuring SLA to detect jitter, tracking objects, delay, connectivity issues!

MPLS – Re-Engineering a 1:1 Customer MPLS L3 VPN Tunnel to serve entire company, tons of ENARSI Topics included in lab, including gotchas for exam day! :)

No PE to CE Adjcancencies, we are getting this entire lab rocking, tonight! šŸ™‚ I don't usually blow away labs as I learn along the way, as I essentially turned all customer into 1:1 mappings across the MPLS, and its just not worth your time reading (you can refer to here for 1:1 Customer mappings). … Continue reading MPLS – Re-Engineering a 1:1 Customer MPLS L3 VPN Tunnel to serve entire company, tons of ENARSI Topics included in lab, including gotchas for exam day! šŸ™‚

MPLS – A necessary closer look at the PE Router settings (VRF / BGP / VPN / Address Family) to see how to setup for new lab!

I have a confession to make - While studying MPLS I largely overlooked the configuration of the Provider Edge because of its complexity and ease of breaking all routing (and probably reversing time). I intentionally used my MPLS Lab for ENARSI 300-410 study with new IP Schemes / CE Protocols to challenge my knowledge of … Continue reading MPLS – A necessary closer look at the PE Router settings (VRF / BGP / VPN / Address Family) to see how to setup for new lab!

MPLS – VPLS (Virtual Private LAN Service) review, another Layer 2 Cloud Transport solution, details inside!

While both AToM and EoM are Point-to-Point Layer 2 MPLS Protocols, and L2TP is NOT related to MPLS (but a Layer 2 Tunneling Protocol all the same), VPLS is meant to be a Point-to-Multipoint or Multipoint-to-Multipoint Protocol to extend L2 across the MPLS. Some Terminology and random points on VPLS TLS - In VPLS terms … Continue reading MPLS – VPLS (Virtual Private LAN Service) review, another Layer 2 Cloud Transport solution, details inside!

MPLS – EoM (Ethernet over MPLS) deeper review, attempted configuration, never worked with it before but lets give it a go!

I've added a couple of Routers to my current MPLS Lab, as the concept to my understanding is that with minor configuration on the PE / CE devices, it should just use the MPLS Network for Transport and that will be that! I have no training material or instructor led training on this, so this … Continue reading MPLS – EoM (Ethernet over MPLS) deeper review, attempted configuration, never worked with it before but lets give it a go!

DMVPN w/ Front Door VRF – Finally got it with static routing instead of trying to use OSPF over the WAN to form Adjacencies!

This won't be a real long lab, as its more just removing OSPF as the WAN, configuring the ISP Router with point to point static routes to each site, then adding a single default route out to the Internet like you would any site in the Front Door VRF and associating both the Physical and … Continue reading DMVPN w/ Front Door VRF – Finally got it with static routing instead of trying to use OSPF over the WAN to form Adjacencies!

MPLS – AToM (Any Transport of MPLS) and EoM (Ethernet over MPLS) overview, very high level review of technology, some configuration examples as well!

So this is getting pretty out of bounds of what I know / have worked with at all, however IĀ  wanted to make a quick note on these technologies so I have reference to them, those two being AToM (Anything over MPLS) and EoM (Ethernet over MPLS). From my understanding AToM is for more dated … Continue reading MPLS – AToM (Any Transport of MPLS) and EoM (Ethernet over MPLS) overview, very high level review of technology, some configuration examples as well!

DMVPN / Front Door VRF – A long lab of trying to get this to work, but it is fighting me all the way, to be continued…

I have to honestly say, I am so relieved (for now) to have this smaller Topology to demonstrate how and why Front Door VRF's work, why they work and why we care about them at all when no Cisco training material mentions them. Warning - This is another post that doesn't really teach you how … Continue reading DMVPN / Front Door VRF – A long lab of trying to get this to work, but it is fighting me all the way, to be continued…

Huge DMVPN / PfR / FVRF Lab – Trying to get things working smoothly but failing, will be going back to basics for now!

First things first is getting DMVPN rocking on this Topology, and from in depth reading into different deployments of DMVPN, it seems the preferred method is to actually have two different DMVPNs running on BR1 and BR2, then configure spokes to be able to reach both (and each other). Its been a lot of head … Continue reading Huge DMVPN / PfR / FVRF Lab – Trying to get things working smoothly but failing, will be going back to basics for now!

Site-to-Site VPN – VTI (Virtual Tunnel Int) VPN discussion, configuration, and differences from Legacy Site-to-Site VPN!

One thing to note when going through DMVPN / Legacy or VTY Site-to-Site IPSec VPN profiles, is the IPSec configuration is basically always the same, though it has many variables that can be fine tuned whether its building an IPSec Profile to apply to a Tunnel Interface or building a Crypto Map both require basically … Continue reading Site-to-Site VPN – VTI (Virtual Tunnel Int) VPN discussion, configuration, and differences from Legacy Site-to-Site VPN!